diff --git a/build.py b/build.py
index e441b7b..c713b1e 100644
--- a/build.py
+++ b/build.py
@@ -1,5 +1,6 @@
 import shutil
 import os
+import re
 import sys
 import subprocess
 import threading
@@ -39,11 +40,19 @@ if os.path.exists(p2c_bat):
             if "ld.lld" in low and (".bin" in low or "output" in low):
                 link_line = line.rstrip("\r\n")
 if link_line is not None:
-    elf_line = link_line.replace("--oformat binary", "").replace("--strip-all", "")
-    elf_line = elf_line.replace("kernel.bin", "kernel.elf")
-    print("[build] linking kernel.elf for analysis ...")
-    if os.system(elf_line) != 0:
-        print("[build] 警告: kernel.elf 链接失败（不影响 kernel.bin）")
+    # 稳健改写：--oformat 可能是 "--oformat binary" 或 "--oformat=binary"；输出可能是
+    # "-o <path>" 或 "--output=<path>"。任一没匹配上就放弃（绝不去执行原样命令，否则会把
+    # kernel.bin 覆盖成非预期产物）。
+    elf_line = re.sub(r"--oformat[ =]binary", "", link_line)
+    elf_line = re.sub(r"--strip-all", "", elf_line)
+    elf_line = re.sub(r"(-o\s+)\S+", r"\1" + kernel_elf, elf_line)
+    elf_line = re.sub(r"(--output=)\S+", r"\1" + kernel_elf, elf_line)
+    if elf_line == link_line or kernel_elf not in elf_line:
+        print("[build] 警告: 未能改写链接命令，跳过 kernel.elf（避免误覆盖 kernel.bin）")
+    else:
+        print("[build] linking kernel.elf for analysis ...")
+        if os.system(elf_line) != 0:
+            print("[build] 警告: kernel.elf 链接失败（不影响 kernel.bin）")
 else:
     print("[build] 警告: 未从 phase2command 取到链接命令，跳过 kernel.elf")